MHT CET 2025 Physics question

In a photoelectric experiment, if the intensity of incident light is doubled and the frequency is kept slightly greater than threshold frequency, then the saturation photoelectric current

(A)remains constant
(B)is halved
(C)is doubledCorrect
(D)becomes four times

Answer: (C)

Solution

For a frequency above the threshold, the number of photons incident per second is proportional to the intensity of light, and each photon (with probability independent of intensity) ejects at most one electron. Hence the number of photoelectrons emitted per second, and therefore the saturation current, is directly

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Question ID VK-100699